To express elapsed time, use colons, periods and no spaces:
In a scientific or technical context, express precise measurements of elapsed time by means of the internationally recognized symbols of time: d for day, h for hour, m i n for minute and s for second.
- 7 h 20 flying time
- The test run took precisely 1 d 3 h 43 min 09 s.
These symbols should also be used when units of time are expressed with SI units:
- 16 km/d (16 kilometres per day)
- 10 J/h (10 joules per hour)
- 18 m/s (18 metres per second)
- 60 r/min (60 revolutions per minute)
Additional information
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